<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><br><div apple-content-edited="true">
<div><div style="orphans: 2; widows: 2; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div>Hi Gamaliel,</div><div><br></div></div></div></div><div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><div>Hi Experts </div><div><br></div><div>My problem is as follows: </div><div><br></div><div>I need generate a 3D head model from a resonance, then co register this head model with 10-20 electrode system to create my lead field matrix. </div></div></blockquote>this will work if you have the 3D position of the electrodes. <br><blockquote type="cite"><div dir="ltr"><div>According to the tutorial: </div><div><br></div><div>"Creating a volume conduction model of the head for source reconstruction of EEG-data" </div><div><br></div><div>I have generated head model but I do not have the lead field correctly done, because I do not know that function gives me the coregistration with the electrode system and tutorial only goes to show the volume generated with the electrodes on the surface. </div></div></blockquote>see here how to co-register the electrodes (scroll down to the bottom of the page): </div><div><a href="http://fieldtrip.fcdonders.nl/tutorial/headmodel_eeg?s[]=coregister&s[]=electrodes">http://fieldtrip.fcdonders.nl/tutorial/headmodel_eeg?s[]=coregister&s[]=electrodes</a></div><div><br></div><div>please note that using the search field with search terms “coregister electrodes” leads you to this page ;-). Also check the help of the function ft_electroderealign<br><blockquote type="cite"><div dir="ltr"><div><br></div><div>Finally I need is to know how I can co-register my head model with my electrode system to generate my lead field matrix.</div></div></blockquote>see above<br><blockquote type="cite"><div dir="ltr"><div> I also need to know how into matrix can I simulate dipole sources for then perform analysis of source reverse. </div></div></blockquote>simulating a dipole is usually done with ft_dipolesimulation. Also the first part of this recently introduced FAQ gives you an example how to do this:</div><div><br></div><div><a href="http://fieldtrip.fcdonders.nl/example/combineplanar_pipelineorder?s[]=planar&s[]=gradient">http://fieldtrip.fcdonders.nl/example/combineplanar_pipelineorder?s[]=planar&s[]=gradient</a></div><div><br></div><div>good luck</div><div>tzvetan</div><div><br></div><div><blockquote type="cite"><div dir="ltr"><div><br></div><div>I hope you can help </div><div><br></div><div><br></div><div>greetings </div><div><br></div><div>Bless</div><div><br></div>-- <br><div dir="ltr"><div style="text-align:center"><font color="#20124d"><b>Gamaliel Huerta</b></font></div><div style="text-align:center"><font color="#20124d"><b>Ingeniería Civil Biomédica</b></font></div><div style="text-align:center"><font color="#20124d"><b>Universidad de Valparaíso</b></font></div></div>
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